Verywell Health on MSN

What are heart sounds and how to know if they’re normal

Medically reviewed by Jeffrey S. Lander, MD Key Takeaways S1 and S2 are the normal heart sounds you hear when the heart ...
The Daily Signal

Fact Check: ‘There Is No Such Thing as a Heartbeat at 6 Weeks,’ Says Stacey Abrams

Ben Johnson is senior reporter and editor at The Washington Stand. Stacey Abrams, the Democratic candidate for governor of Georgia, denied that unborn children have a heartbeat at six weeks and that ...
BBC

Sound and ultrasound - Edexcel

Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing – above 20,000 Hertz (Hz). Different species of ...